本文選題：圓弧拱形蜂窩梁 + 平面外穩(wěn)定��； 參考：《西安工業(yè)大學(xué)》2017年碩士論文

【摘要】：拱形蜂窩梁同時具有實腹拱和腹板開洞直梁的優(yōu)點,拱形蜂窩梁可以實現(xiàn)大跨度的穩(wěn)定承載體系,節(jié)約鋼材,其孔洞便于敷設(shè)管道和電線,并且造型充滿動感,其應(yīng)用越來越為廣泛。但是,拱形蜂窩梁在沒有側(cè)向支撐或者側(cè)向支撐不足時,將在發(fā)生面內(nèi)失穩(wěn)之前發(fā)生面外失穩(wěn)。目前,在實際工程中,大多靠經(jīng)驗來布置側(cè)向支撐,且在學(xué)術(shù)領(lǐng)域,對蜂窩拱面外失穩(wěn)問題、特別是側(cè)向支撐對其承載力影響的研究較少。本文將分別對無側(cè)向支撐和有側(cè)向約束時的圓弧拱形蜂窩梁進行平面外穩(wěn)定性能的研究。設(shè)計4根蜂窩拱構(gòu)件進行靜力加載試驗,同時建立有限元模型進行仿真模擬,并將兩者結(jié)果進行對比。通過對比,發(fā)現(xiàn)兩者結(jié)果接近,從而驗證了有限元模型的建立方法是正確的。對無側(cè)向支撐的圓弧拱形蜂窩梁進行平面外彈性屈曲的研究。通過有限元模擬,獲得三種荷載作用下的屈曲荷載,結(jié)合正交試驗法中的極差分析,找出目標因素對拱形蜂窩梁屈曲荷載的影響規(guī)律及影響程度的先后順序,進而給出不同荷載作用下各因素的最優(yōu)組合。結(jié)果表明,影響其平面外彈性屈曲的因素順序為:矢跨比腹板高厚比孔高比。承受相同荷載作用的拱形蜂窩梁,無鉸拱的屈曲荷載比兩鉸拱的屈曲荷載大,且三種因素對其影響的程度越明顯。研究有側(cè)向約束時拱形蜂窩梁的平面外彈性屈曲荷載。首先對只有拱頂單個支撐的蜂窩拱進行屈曲分析,研究側(cè)向支撐點截面位置、側(cè)向支撐剛度、矢跨比對屈曲荷載的影響規(guī)律,結(jié)果表明,側(cè)向支撐應(yīng)布置在上翼緣最為合理,并給出了單個拱頂支撐時的臨界剛度。然后對布置多個等距側(cè)向支撐、承受拱頂集中荷載時的蜂窩拱進行研究,得到結(jié)論:蜂窩拱的屈曲荷載隨側(cè)向支撐數(shù)量的增多(即側(cè)向支撐間距的減小)而增大。且側(cè)向支撐距離為拱的跨度的1/10時,側(cè)向支撐的臨界剛度為最大。隨著矢跨比的增大,等距布置側(cè)向支撐的臨界剛度逐漸減小,這說明,承受拱頂集中荷載的兩鉸拱,其矢跨比越大,側(cè)向支撐就越有效。結(jié)合《拱型鋼結(jié)構(gòu)技術(shù)規(guī)程》中給出的全跨水平均布荷載作用下的雙軸對稱工字形等截面圓弧兩鉸拱不再考慮面外失穩(wěn)時的臨界公式,考慮腹板開圓孔的影響,將拱平面內(nèi)的幾何長細比換算為正則化長細比,給出相同情況下腹板開圓孔后的拱不再考慮面外穩(wěn)定時的臨界公式。
[Abstract]:The arch honeycomb beam has the advantages of both the solid web arch and the straight beam with web opening. The arch honeycomb beam can realize the stable bearing system of large span, save steel, facilitate the laying of pipes and wires, and the shape is full of motion. Its application is more and more extensive. However, when there is no lateral support or insufficient lateral bracing, the out-of-plane instability of arch honeycomb beam will occur before in-plane instability occurs. At present, in practical engineering, most of the lateral braces are arranged by experience, and in the academic field, there is little research on the out-of-plane instability of honeycomb arch, especially the influence of lateral bracing on its bearing capacity. In this paper, the out-of-plane stability of circular arched honeycomb beams without lateral support and with lateral constraints is studied respectively. Four honeycomb arch members were designed to carry out static loading test. At the same time, the finite element model was established for simulation, and the two results were compared. By comparison, it is found that the two results are close, which verifies the establishment of the finite element model is correct. The elastic buckling of arc-arched honeycomb beams without lateral support is studied. Through the finite element simulation, the buckling loads under three kinds of loads are obtained. Combining with the range analysis in the orthogonal test method, the influence law and the order of influence degree of the target factors on the buckling loads of the arch honeycomb beams are found out. Furthermore, the optimal combination of various factors under different loads is given. The results show that the order of the factors affecting the out-of-plane elastic buckling is: the rise-span ratio, the ratio of the height to the thickness of the web, the ratio of the hole to the height. The buckling load of arched honeycomb beams subjected to the same load is larger than that of two-hinged arch, and the effect of three factors is more obvious. The external elastic buckling loads of arched honeycomb beams with lateral constraints are studied. First of all, the buckling analysis of honeycomb arch with single bracing with arch roof is carried out to study the influence of lateral support point section position, lateral support stiffness and sagittal span ratio on buckling load. The results show that lateral bracing should be arranged on the upper flange most reasonably. The critical stiffness of single arch support is given. Then, the paper studies the honeycomb arch with multiple isometric lateral braces, which are subjected to concentrated load on the top of the arch. It is concluded that the buckling load of the honeycomb arch increases with the increase of the number of lateral braces (that is, the decrease of lateral bracing spacing). When the lateral support distance is 1 / 10 of the span of the arch, the critical stiffness of the lateral bracing is the largest. With the increase of the rise-span ratio, the critical stiffness of the lateral bracing with isometric arrangement decreases gradually, which shows that the more the rise-span ratio of the arch is, the more effective the lateral bracing is. Combined with the double axisymmetric I-shaped circular arc two-hinged arch given in the Technical Specification for Arch Steel structures under horizontal uniform load with full span, the critical formula for out-of-plane instability is no longer considered, and the influence of web opening is considered. The geometric slenderness ratio in the arch plane is converted to regularized slenderness ratio, and the critical formula for the arch after the web opening is given under the same condition is not considered when the external stability is not considered.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391

【參考文獻】

相關(guān)期刊論文 前9條

1 姜麗云;楊森浩;李明;;加腋鋼框架結(jié)構(gòu)的靜力彈塑性性能研究[J];鋼結(jié)構(gòu);2014年09期

2 竇超;郭彥林;;均勻受壓圓弧拱平面外彈塑性穩(wěn)定設(shè)計方法[J];建筑結(jié)構(gòu)學(xué)報;2012年01期

3 林小雄;喬穎;;淺析靜力法與能量法的區(qū)別與聯(lián)系[J];技術(shù)物理教學(xué);2011年03期

4 黃富民;丁冰泉;伍俊榮;鄒士洋;;超濾處理高濁度原水系統(tǒng)的正交試驗設(shè)計[J];凈水技術(shù);2011年04期

5 劉瑞江;張業(yè)旺;聞崇煒;湯建;;正交試驗設(shè)計和分析方法研究[J];實驗技術(shù)與管理;2010年09期

6 劉茉;樊江;陳光;;側(cè)向支撐對楔形梁整體穩(wěn)定性的有限元分析[J];工業(yè)建筑;2010年S1期

7 喬彩虹;郭彥林;曹玉生;;圓管截面兩鉸圓弧純壓拱的平面外穩(wěn)定性及設(shè)計方法[J];工業(yè)建筑;2009年12期

8 許強,童根樹;單軸對稱工字形截面圓弧拱的屈曲分析[J];建筑結(jié)構(gòu)學(xué)報;2001年03期

9 林英,陳寶春,陳友杰;鋼管拱面內(nèi)對稱加載試驗[J];福州大學(xué)學(xué)報(自然科學(xué)版);2001年02期

相關(guān)博士學(xué)位論文 前2條

1 黃李驥;腹板開洞工形截面拱的穩(wěn)定性能及設(shè)計方法研究[D];清華大學(xué);2005年

2 龐善起;正交表的構(gòu)造方法及其應(yīng)用[D];西安電子科技大學(xué);2003年

相關(guān)碩士學(xué)位論文 前10條

1 祝建軍;工字形受壓翼緣板的寬度和側(cè)向支撐對鋼梁整體穩(wěn)定的影響[D];重慶交通大學(xué);2015年

2 袁海龍;混用鋼號蜂窩梁性能研究[D];西安建筑科技大學(xué);2015年

3 李明;側(cè)向支撐對腹板開洞型圓弧鋼拱平面外穩(wěn)定性能影響的研究[D];內(nèi)蒙古工業(yè)大學(xué);2014年

4 張堯;楔形寬腹工字形截面壓彎構(gòu)件平面內(nèi)穩(wěn)定承載力的試驗研究[D];西安建筑科技大學(xué);2010年

5 陳光;側(cè)向支撐對圓弧拱平面外穩(wěn)定性能影響的研究[D];昆明理工大學(xué);2010年

6 陳雪平;混合水平正交表交互作用的研究[D];華東師范大學(xué);2009年

7 曹欣;大跨度多弧形鋼拱結(jié)構(gòu)的受力性能研究[D];西安建筑科技大學(xué);2008年

8 曾濤;H型截面鋼拱平面外的穩(wěn)定研究[D];昆明理工大學(xué);2008年

9 吳勇軍;支撐位置對鋼構(gòu)件穩(wěn)定承載力的影響[D];河海大學(xué);2005年

10 鄒錦華;圓孔蜂窩梁受力性能試驗研究[D];廣西大學(xué);2003年

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